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authorMike Galbraith <efault@gmx.de>2009-09-09 15:41:37 +0200
committerIngo Molnar <mingo@elte.hu>2009-09-09 17:30:06 +0200
commit61cbe54d9479ad98283b2dda686deae4c34b2d59 (patch)
treee7d4766daaf2895aab96b035a973b67439baecf2
parent172e082a9111ea504ee34cbba26284a5ebdc53a7 (diff)
sched: Keep kthreads at default priority
Removes kthread/workqueue priority boost, they increase worst-case desktop latencies. Signed-off-by: Mike Galbraith <efault@gmx.de> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <1252486344.28645.18.camel@marge.simson.net> Signed-off-by: Ingo Molnar <mingo@elte.hu>
-rw-r--r--kernel/kthread.c4
-rw-r--r--kernel/workqueue.c2
2 files changed, 0 insertions, 6 deletions
diff --git a/kernel/kthread.c b/kernel/kthread.c
index eb8751aa041..5fe709982ca 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -16,8 +16,6 @@
#include <linux/mutex.h>
#include <trace/events/sched.h>
-#define KTHREAD_NICE_LEVEL (-5)
-
static DEFINE_SPINLOCK(kthread_create_lock);
static LIST_HEAD(kthread_create_list);
struct task_struct *kthreadd_task;
@@ -145,7 +143,6 @@ struct task_struct *kthread_create(int (*threadfn)(void *data),
* The kernel thread should not inherit these properties.
*/
sched_setscheduler_nocheck(create.result, SCHED_NORMAL, &param);
- set_user_nice(create.result, KTHREAD_NICE_LEVEL);
set_cpus_allowed_ptr(create.result, cpu_all_mask);
}
return create.result;
@@ -221,7 +218,6 @@ int kthreadd(void *unused)
/* Setup a clean context for our children to inherit. */
set_task_comm(tsk, "kthreadd");
ignore_signals(tsk);
- set_user_nice(tsk, KTHREAD_NICE_LEVEL);
set_cpus_allowed_ptr(tsk, cpu_all_mask);
set_mems_allowed(node_possible_map);
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 0668795d881..ea1b4e7674d 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -317,8 +317,6 @@ static int worker_thread(void *__cwq)
if (cwq->wq->freezeable)
set_freezable();
- set_user_nice(current, -5);
-
for (;;) {
prepare_to_wait(&cwq->more_work, &wait, TASK_INTERRUPTIBLE);
if (!freezing(current) &&